Boiler Service Cost
£80–£150
typical UK range
Updated
A boiler service in the UK costs between £80 and £150 for most properties. London and the South East typically run £120–£160. Annual servicing keeps your boiler running efficiently, maintains the manufacturer warranty, and catches faults before they become breakdowns.
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How much does each option cost?
| Type / scope | Typical cost | Notes |
|---|---|---|
| Standard boiler service (outside London)Service including safety checks, cleaning heat exchanger and burner, flue gas analysis, and system pressure check. 45–75 minutes | £80–£120 | Service including safety checks, cleaning heat exchanger and burner, flue gas analysis, and system pressure check. 45–75 minutes |
| Standard boiler service (London and South East)Same service as above; higher rates reflect London operating costs | £120–£160 | Same service as above; higher rates reflect London operating costs |
| Service plus basic parts (washers, seals)Many engineers include minor consumable parts (seals, diverter valve washers) if needed during the service | £100–£150 | Many engineers include minor consumable parts (seals, diverter valve washers) if needed during the service |
| Combined boiler service and CP12 (landlord)Bundled annual service and landlord gas safety certificate in one visit — more efficient than two separate appointments | £110–£180 | Bundled annual service and landlord gas safety certificate in one visit — more efficient than two separate appointments |
| Annual service contract (per year)Some engineers offer annual service plans by direct debit, sometimes with added benefits like priority call-out or discounted repairs | £80–£150 | Some engineers offer annual service plans by direct debit, sometimes with added benefits like priority call-out or discounted repairs |
What affects the price?
- Location — London engineers typically charge £120–£160 for a standard service; national average is £80–£120
- Boiler age and condition — older boilers may require more thorough inspection and cleaning, taking longer and sometimes revealing parts that need replacement
- Type of boiler — combi boilers are the most common and most straightforward to service; system boilers with cylinders require additional checks on the cylinder and unvented components
- Whether a CP12 is also needed — combining both in one visit is typically the most cost-effective approach for landlords
- Last service date — a boiler that hasn't been serviced in 3+ years may require more work to bring back to a good standard
- Manufacturer warranty requirements — some manufacturers (e.g. Worcester Bosch) require annual services by registered engineers to maintain warranty validity
What's included in the price?
- Visual inspection of the boiler, casing, flue, and visible pipework
- Combustion analysis (flue gas analysis) to verify the boiler is burning gas efficiently and safely
- Cleaning of the heat exchanger, burner, and internal components
- Checking all safety devices — pressure relief valve, gas valve, overheat thermostat
- Checking the system pressure and topping up if low
- Checking the condensate trap and drain (for condensing boilers)
- Testing all controls — thermostat, programmer, and zone valves
- Reporting any defects or advisory items to the homeowner
- Signing the Benchmark service record (required for most manufacturer warranties)
How long does it take?
A standard annual boiler service takes 45–75 minutes for most modern condensing combi boilers. Older boilers, or those that haven't been serviced recently, may take longer due to more thorough cleaning needed. If the engineer finds a fault requiring additional investigation or parts, the visit may extend to 1.5–2 hours. You should be at home for the full duration — the engineer may need access to the boiler location, any controls, and the condensate drain outlet.
Do I need one?
An annual boiler service is strongly recommended for all gas boilers, though not legally required for homeowners. Key reasons to service annually: (1) Manufacturer warranty requirements — most boiler manufacturers (Worcester Bosch, Vaillant, Viessmann) require annual services by a registered engineer to maintain the warranty. Missing a service can void the warranty. (2) Safety — a service checks that the boiler is burning gas safely and that flue gases are being expelled correctly. Carbon monoxide leaks are rare in well-maintained boilers but serious. (3) Efficiency — a clean, well-maintained boiler runs more efficiently, reducing gas bills. (4) Reliability — catching minor faults (a worn seal, a scaling issue) during an annual service prevents major breakdowns, particularly in winter. For landlords, an annual gas safety check (CP12) is legally required, but this is not the same as a service — both are needed.
How do you avoid overpaying?
- Set up an annual service contract or direct debit plan — many engineers charge slightly less for committed annual customers versus one-off bookings
- Book during spring or summer — heating engineers are quieter in warmer months and may offer more flexible pricing or promotional rates
- Bundle with a CP12 if you're a landlord — one visit for both is more efficient and usually cheaper than two
- Stay with the same engineer year-on-year — a familiar engineer who knows your boiler works faster and notices changes from the previous service more easily
- Consider a boiler care plan from a provider — British Gas, HomeServe, and boiler manufacturers offer annual service plans that include the service plus parts and labour cover, sometimes at a competitive total cost
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Frequently asked questions
We’re happy to answer all your questions.
How much does a boiler service cost?
A standard boiler service costs £80–£120 outside London, and £120–£160 in London and the South East. The price varies by location, engineer, boiler type, and condition. Budget for £80–£150 for most properties.
How often should a boiler be serviced?
Once a year. Most manufacturer warranties require annual servicing to remain valid. Annual servicing also catches faults early, maintains efficiency, and ensures the boiler is burning safely.
Can any Gas Safe engineer service my boiler?
Any Gas Safe registered engineer with the relevant domestic gas qualifications (CCN1, CEN1) can service a domestic gas boiler. For warranty purposes, some manufacturers recommend or require use of their approved (accredited) installer network — check your warranty documents.
What happens if the boiler fails its service?
If the engineer finds a fault during the service, they'll recommend repairs. Minor issues (worn seal, blocked condensate trap) are often fixed during the visit at a small additional charge. Major faults (cracked heat exchanger, failed gas valve) will require parts and labour — the engineer will quote separately. If the fault is serious and the boiler is old, they may recommend replacement.
Does a boiler service include a gas safety certificate?
No — a boiler service is maintenance; a CP12 gas safety certificate is a legal inspection document for rented properties. They're different procedures. Many engineers can do both at the same visit for a combined price, but they're distinct records.
Sources & References
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